feat(drive): remove all owner_id from {File,Folder}Dto

src/application/dtos/favorites_dto.rs

@@ -55,11 +55,6 @@ pub struct FavoriteItemDto {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub item_path: Option<String>,
 
-    /// UUID of the file/folder's actual owner (may differ from `user_id` when
-    /// the item was shared and then favourited by another user).
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub owner_id: Option<String>,
-
     // ── Pre-computed display fields ──
     /// FontAwesome icon CSS class (e.g. "fas fa-file-image", "fas fa-folder")
     pub icon_class: String,
@@ -124,10 +119,6 @@ pub struct FavoriteResourceRow {
     pub size: i64,
     pub resource_created_at: DateTime<Utc>,
     pub modified_at: DateTime<Utc>,
-    /// Post-D7: nullable on new rows (the legacy `storage.{files,folders}.user_id`
-    /// column is no longer written). `is_owner` is now `false` when
-    /// this is `None` — see the SQL projection in favorites repo.
-    pub owner_id: Option<Uuid>,
     /// Drive that owns this row. Surfaced on the favorites listing
     /// so a UI can tell when a favorited item lives in a different
     /// drive than the user's home (post-D6 cross-drive moves +

src/application/dtos/file_dto.rs

@@ -54,10 +54,6 @@ pub struct FileDto {
     /// Human-readable formatted size (e.g. "3.27 MB")
     pub size_formatted: String,
 
-    /// Owner user ID (omitted from JSON when None)
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub owner_id: Option<String>,
-
     /// Sort date for Photos timeline — COALESCE(EXIF captured_at, created_at).
     /// Only populated by the /api/photos endpoint.
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -102,7 +98,7 @@ impl From<File> for FileDto {
         let content_hash = file.content_hash().to_string();
 
         // Consume the entity by moving all fields — zero heap allocations
-        // for id, name, path, folder_id, owner_id (previously 5× .to_string()).
+        // for id, name, path, folder_id (previously 4× .to_string()).
         let parts = file.into_parts();
 
         let icon_class = Arc::from(icon_class_for(&parts.name, &parts.mime_type));
@@ -124,7 +120,6 @@ impl From<File> for FileDto {
             icon_special_class,
             category,
             size_formatted,
-            owner_id: parts.owner_id.map(|u| u.to_string()),
             sort_date: None,
             content_hash,
             etag,
@@ -157,9 +152,8 @@ impl FileDto {
     ///
     /// Used when a file is returned to a share recipient: `path` reveals the
     /// full folder hierarchy above the file which the recipient may not have
-    /// access to.  `folder_id` and `owner_id` are intentionally kept — the
-    /// former is needed for sub-folder navigation (covered by the cascade
-    /// grant), and the latter is harmless metadata.
+    /// access to.  `folder_id` is intentionally kept — it's needed for
+    /// sub-folder navigation (covered by the cascade grant).
     #[must_use]
     pub fn without_hierarchy_info(self) -> Self {
         Self {
@@ -183,7 +177,6 @@ impl FileDto {
             icon_special_class: Arc::from(""),
             category: Arc::from("Document"),
             size_formatted: "0 Bytes".to_string(),
-            owner_id: None,
             content_hash: String::new(),
             etag: String::new(),
             sort_date: None,

src/application/dtos/folder_dto.rs

@@ -48,10 +48,6 @@ pub struct FolderDto {
     /// Parent folder ID
     pub parent_id: Option<String>,
 
-    /// Owner user ID (scopes visibility per user)
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub owner_id: Option<String>,
-
     /// Drive that owns this folder. The scope axis for path-based
     /// lookups across REST / WebDAV / NextCloud / CalDAV / CardDAV.
     /// Post-D0 `storage.folders.drive_id` is `NOT NULL`; stub /
@@ -111,7 +107,6 @@ impl From<Folder> for FolderDto {
             name: folder.name().to_string(),
             path: folder.path_string().to_string(),
             parent_id: folder.parent_id().map(String::from),
-            owner_id: folder.owner_id().map(|u| u.to_string()),
             drive_id: folder.drive_id(),
             created_at: folder.created_at(),
             modified_at: folder.modified_at(),
@@ -147,9 +142,8 @@ impl FolderDto {
     ///
     /// Used when a folder is returned to a share recipient: `path` reveals the
     /// full folder hierarchy above the shared folder which the recipient may
-    /// not have access to.  `parent_id` and `owner_id` are intentionally kept
-    /// — the former is needed for sub-folder navigation (covered by the
-    /// cascade grant), and the latter is harmless metadata.
+    /// not have access to.  `parent_id` is intentionally kept — it's needed
+    /// for sub-folder navigation (covered by the cascade grant).
     #[must_use]
     pub fn without_hierarchy_info(self) -> Self {
         Self {
@@ -165,7 +159,6 @@ impl FolderDto {
             name: "stub-folder".to_string(),
             path: "/stub/path".to_string(),
             parent_id: None,
-            owner_id: None,
             drive_id: Uuid::nil(),
             created_at: 0,
             modified_at: 0,
@@ -205,11 +198,6 @@ pub struct FolderResourceRow {
     pub size: i64,
     pub created_at: DateTime<Utc>,
     pub modified_at: DateTime<Utc>,
-    /// Post-D7: the legacy `user_id` column on `storage.{files,folders}`
-    /// is nullable — new rows leave it NULL — so this optional. UI
-    /// surfaces should prefer `created_by` / `updated_by` on the
-    /// per-resource DTO instead.
-    pub owner_id: Option<Uuid>,
     /// Drive that owns this row. Same column as
     /// `storage.folders.drive_id` / `storage.files.drive_id`. Surfaced
     /// on the listing so a UI can tell when a child lives in a

src/application/dtos/recent_dto.rs

@@ -104,10 +104,6 @@ pub struct RecentResourceRow {
     pub size: i64,
     pub resource_created_at: DateTime<Utc>,
     pub modified_at: DateTime<Utc>,
-    /// Post-D7: nullable on new rows (the legacy
-    /// `storage.{files,folders}.user_id` column is no longer written).
-    /// Consumers should prefer §14 provenance columns.
-    pub owner_id: Option<Uuid>,
     /// Drive that owns this row. Surfaced on the recent listing
     /// so a UI can tell when a recently-accessed item lives in a
     /// different drive than the user's home (post-D6 cross-drive

src/application/dtos/trash_dto.rs

@@ -60,10 +60,6 @@ pub struct TrashResourceRow {
     pub size: i64,
     pub resource_created_at: DateTime<Utc>,
     pub modified_at: DateTime<Utc>,
-    /// Post-D7: nullable on new rows (the legacy `storage.{files,folders}.user_id`
-    /// column is no longer written). Consumers should prefer §14
-    /// provenance columns when available.
-    pub owner_id: Option<Uuid>,
     /// Drive the trashed item belongs to. Surfaced verbatim on the wire
     /// (`TrashResourceItemDto.drive_id`) so the `/trash` UI can group by
     /// drive without an extra lookup per row. D2b: filtering by drive is